Step 1

Line a very small ovenproof baking pan, glass dish or mini loaf pan (I've used 5 sq inches and also a 5x3 inch mini metal loaf pan) with baking paper and trim. Spray with a little oil.

Step 2

Pre-heat air fryer or oven to 320F/160C.

Step 3

In a small bowl, whisk the egg into the mashed banana. Then whisk in the sugar, oil, and milk.

Step 4

Add the flour and baking soda and salt and mix until just combined. Add a drizzle more milk if the mixture seems at all dry (certain flours such as whole wheat and coconut are more absorbent than all purpose flour). Fold in any mix-ins e.g. chocolate chips, nuts.

Step 5

Pour the batter into the prepared pan and bake in your oven or air fryer for 25 to 35 minutes or until a skewer poked into the bottom of the cake comes out clean. A little bit of sticky-ness is fine. For me it takes 30 to 35 minutes in my air fryer and 25 minutes in my oven.

Step 6

Let cool for 10 minutes in the tin/dish, then transfer to a wire rack to cool.